Re: [sqlalchemy] Re: How to query for something like this?
Anyway thanks, it'll help a lot. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
Re: [sqlalchemy] Re: How to query for something like this?
Yes, but I think this will be expensive to arrange it with python because I need to return everything at once. I though I could just group_by with some annotation, but I couldn't figure out how. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
[sqlalchemy] How to query for something like this?
Supose I have the models below, how could I query for a result like this:
[
{1: [{"id": 3, "location": "POINT(23.23423423 54.234524234)"},{"id": 4,
"location": "POINT(23.23423423 54.234524234)"}]},
{2: [{"id": 45, "location": "POINT(78.23423423 43.234524234)"},{"id": 67,
"location": "POINT(34.2347683423 74.234524234)"}]},
]
The keys being the vehicle id and a list of HistoryPoints values.
Supposing I have more fields in HistoryPoint and is prefered to query on it
due some filter conditions.
class Vehicle(Base):
id = Column(Integer, primary_key=True)
identifier = Column(Integer)
class HistoryPoint(Base):
vehicle_id = Column(Integer, FokeignKey('vehicles.id'))
location = Column(Geography('POINT'))
vehicle = relationship('Vehicle', backref='history')
I'm really having a hard time on this, any help will be appreciated
Johnny
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[sqlalchemy] There is any chance to SQLAlchemy works with syncio?
Hi guys, I would like to know if theres is any chances to SQLAlchemy support asyncio out of the box? Like the ORM and such. Thanks Johnny -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
Re: [sqlalchemy] There is any chance to SQLAlchemy works with syncio?
Thanks for your lightning fast reply! Actually my interest in asyncio is guided pretty much because I'm using autobahn to do non-blocking websocket stuffs and and since it uses asyncio I thought it would be seamless if I could use it to handle DB non-blocking operations too. I'll take a look at your blog post for a matter of clarification and try to figure something out. Probably I'll show up here again soon. Thanks On Wed, Sep 16, 2015 at 11:37 AM, Mike Bayer <mike...@zzzcomputing.com> wrote: > > > On 9/16/15 10:17 AM, Johnny W. Santos wrote: > > Hi guys, > > I would like to know if theres is any chances to SQLAlchemy support > asyncio out of the box? Like the ORM and such. > > > Well the "real" answer is "yes", which is that you'd put your ORM business > logic in a threadpool using > https://docs.python.org/3/library/asyncio-eventloop.html#executor. This > will by far get you the best separation of asyncio's ORM-unfriendly > concepts, the superior performance of traditional threads for that work, > and the programming patterns that some people find important in asyncio on > the outside of the traditional ORM-centric code. For rationale on this > as well as proof that asyncio's slowness and database awkwardness is > entirely not worth it nor even appropriate, see > http://techspot.zzzeek.org/2015/02/15/asynchronous-python-and-databases/. > > As far as an asyncio-explicit API for SQLAlchemy ORM, ORMs can't work very > well with asyncio because they rely upon "lazy loading", which is a > programming pattern directly in opposition to the philosophies of asyncio. > That said, the Core can be made to work in an asyncio fashion but there's > no roadmap for doing this extremely large amount of work (issue is at > https://bitbucket.org/zzzeek/sqlalchemy/issues/3414/asyncio-and-sqlalchemy). > > > There's also a project that re-implements very partial versions of parts > of the Core to work on top of asynchronous psycopg2, that is > https://github.com/aio-libs/aiopg. Note however this project > re-implements the execution internals completely so basic features like > column defaults and datatypes won't really work as designed. > > IMO there *is* a technically appropriate and performant solution to your > problem but it would require that you release any dogmatism you might have > over the use of traditional threaded code within the context of explicit > async code. > > > Thanks > > Johnny > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > -- Johnny W. dos Santos -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
[sqlalchemy] Auto generation of tables
This could be sort of a FAQ. I skimmed this list but found nothing
appropriate.
I'm looking for a way to auto-generate translation (in the i18n sense)
tables for translatable columns to avoid writing the boilerplate, like in
(as probably everybody would do):
class WhatNot(Base):
...
class Language(Base):
...
class WhatNot_I18N(Base):
WhatNot_Id = Column(Integer, ForeignKey('WhatNot.Id'), primary_key=True)
Language_Id = Column(Integer, ForeignKey('Language.Id'), primary_key=True)
Description = Column(Unicode(128))
OtherText = Column(Unicode(128))
So for every WhatNot there would be one or more WhatNot_I18N for the
various translations of Description and OtherText.
I'm sure with SA there would be a way to automate creating such a
translation table on the fly when defining the master table, either with
@decorators, or like zzzeek's
magichttp://techspot.zzzeek.org/2011/05/17/magic-a-new-orm.
I've tried many ways, but to no success (well I've just started using it
for a few days). Has anybody succeeded in doing such a thing, or what would
be the best path towards it?
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[sqlalchemy] sqlalchemy introspection How?
I have tables created using another orm. I just want to know, how I can create sqlalchemy classes based on the tables, that are already there in the database? Thank you --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
